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{{Language_sel|LANG=ger|ARTIKEL=Prüfklima}}
{{PSM_Infobox}}
<span style="font-size:1.2em;font-weight:bold;">Test climate</span>
__FORCETOC__

==General information==

To ensure reproducibility when determining [[Material Value|characteristic values]] in [[Polymer Testing|polymer testing]], it is necessary to guarantee a defined production of [[Specimen|test specimens]], sufficient consistency of the test climate, and the achievement of a state of equilibrium with regard to temperature and humidity in the test specimen [1]. In the case of plastics, even slight variations in test conditions, such as ambient temperature and humidity, can cause significant changes in characteristic value levels. For this reason, so-called “standard atmospheres” or "standard climates" have been defined as test conditions in order to simulate practical conditions.

==Standard climate and classes of standard climates==

The standard climate according to ISO 291 [2] requires an air temperature of 23 °C and a relative humidity of 50 % . This standard specifies two different classes of [[Standard Atmospheres|standard atmospheres]] (standard climates) according to the different deviation ranges. Class 1 specifies a permissible deviation from the temperature of ± 1 °C and from the relative humidity of ± 5 %. Class 2 specifies a deviation from the temperature of ± 2 °C and from the relative humidity of ± 10 %.

==Types of air conditioning for conditioning and testing==

To ensure that the test specimens are in a reproducible condition, either the entire test laboratory must be air-conditioned or the test specimens must be conditioned to the appropriate test climate. While a period of 4 hours is sufficient for temperature stabilization, a longer normalization period is required for humidity stabilization using climate chambers ('''Fig. 1''') [1]. Once the equilibrium conditions have been set, the test specimens must be stored in a desiccator under defined conditions before being tested in the air-conditioned test laboratory.

[[File:pruefklima1.jpg]]
{|
|- valign="top"
|width="50px"|'''Fig. 1''':
|width="600px" |Climate chamber VIT 280 from Vötsch Industrietechnik GmbH, Bailingen
|}

Special conditions apply to [[Plastics|plastics]] such as polyamide ([[Plastics – Symbols and Abbreviated Terms|abbreviation]]: PA), which absorb moisture under standard conditions depending on the matrix type and [[Particle-filled Thermoplastics|fillers]] and [[Fibre-reinforced Plastics|reinforcing materials]].

Further information on special conditioning regimes for achieving equilibrium in test specimens made of various plastics is provided, for example, by Brown in [3].

==See also==

* [[Standard Atmospheres|Standard atmospheres]]
* [[Specimen]]
* [[Test Piece|Test piece]]
* [[Water Absorption|Water absorption]]
* [[Ageing]]

==References==

{|
|-valign="top"
|[1]
|[[Bierögel, Christian|Bierögel, C.]]: Preparation of specimens. In: [[Grellmann,_Wolfgang|Grellmann, W.]], [[Seidler,_Sabine|Seidler, S.]] (Eds.): Polymer Testing. Carl Hanser, Munich (2022) 3rd Edition, pp. 33–36 (ISBN 978-1-56990-806-8; E-Book: ISBN 978-1-56990-807-5; ePub ISBN 978-156990-808-2; see [[AMK-Library]] under A 22)
|-valign="top"
|[2]
|ISO 291 (2008-05): Plastics – Standard Atmospheres for Conditioning and Testing
|-valign="top"
|[3]
|Brown, R. P. (Ed.): Handbook of Polymer Testing: Physical Methods. Marcel Dekker, New York Basel (1999) (ISBN 0-8247-0171-2; see [[AMK-Library]] under C 5)
|}

[[Category:Specimen Preparation]]
[[Category:Tensile Test]]

Test Climate - Revision history